Mercy Gunderson is a straight shooter with a hard edge. On medical leave from the Army, she returns home to South Dakota, which isn't much safer for her than Iraq. Arriving just after the death of her father, it is up to Mercy to decide what to do with the family ranch. Trying to deal with her irresponsible sister and nephew, while silently coping with her own guilt, Mercy is suddenly pulled into the local community when the body of a Native American boy is found on her land. But nobody seems to be doing anything about it, especially not the local law enforcement.

When tragedy strikes again, Mercy is ready to throw all her energy into her own investigation, and she's out for revenge. As she digs up the truth behind the shocking crimes, Mercy uncovers dark and dangerous secrets and must race to stop a killer before everything she's fought for is destroyed forever.